报 告 人：张跃钢 研究员
报告时间：2013年1月21日（星期一）下午2:30
报告地点：物理科技楼101室
Abstract: Development of advanced electrochemical battery system is required to meet the increasing demands for large-scale electrical energy storage. For the electrode materials of lithium ion batteries, silicon, tin, and some transition metal oxides are well known as high-capacity anode materials. However, these materials suffer from huge volume change during charge and discharge, which leads to poor cycling performance. On the cathode side, sulfur is one of the most promising cathode materials with a high theoretical capacity of about 1675 mAh g-1. However, the current lithium-sulfur cells suffer from the low electronic conductivity of sulfur electrodes and the high solubility of long chain polysulfide ions in organic solvent-based electrolytes. To solve these problems, we designed and fabricated electrochemically active nanocomposite materials by using novel carbon nanostructures, such as graphene, graphene oxides, and porous carbon nanofibers, as matrices. The new nanocomposite anodes (such as graphene-Si, graphene-Sn, graphene-Fe3O4, etc) and cathodes (such as graphene oxide-sulfur, porous carbon nanofiber-sulfur, carbon-Li2S, etc.) enabled us to significantly improve the specific capacities, charge/discharge rates, and cycle lives in rechargeable lithium batteries.
报告人简介：张跃钢，清华大学物理专业学士／硕士，东京大学材料科学专业博士毕业，现任中科院苏州纳米技术与纳米仿生研究所国际实验室主任。曾任美国伯克利国家实验室终身研究员，美国Intel公司高级研究员，日本NEC公司研究员，美国斯坦福大学博士后研究员。主要研究方向为碳与半导体纳米材料合成及结构表征、纳米电子器件研究及能源储存技术。